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FindBLAS: Detect implicitly linked BLAS library

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Run the Check_Fortran_Libraries macro with an *empty* list of libraries
to detect whether the compiler implicitly links BLAS.  If this works,
set `BLAS_LIBRARIES` to a placeholder value to get through the rest of
our logic.  At the end replace the placeholder by a real empty string
again to report to callers.
This commit is contained in:
Hubertus van Dam
2018-08-28 11:02:58 -07:00
committed by Brad King
parent 2c807b75f3
commit 5b8f69ebe9
1 changed files with 28 additions and 2 deletions
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30
Modules/FindBLAS.cmake
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@@ -22,7 +22,8 @@
# BLAS_LINKER_FLAGS - uncached list of required linker flags (excluding -l
# and -L).
# BLAS_LIBRARIES - uncached list of libraries (using full path name) to
# link against to use BLAS
# link against to use BLAS (may be empty if compiler implicitly links
# BLAS)
# BLAS95_LIBRARIES - uncached list of libraries (using full path name)
# to link against to use BLAS95 interface
# BLAS95_FOUND - set to true if a library implementing the BLAS f95 interface
@@ -163,7 +164,11 @@ macro(Check_Fortran_Libraries LIBRARIES _prefix _name _flags _list _thread)
mark_as_advanced(${_prefix}${_combined_name}_WORKS)
set(_libraries_work ${${_prefix}${_combined_name}_WORKS})
endif()
if(NOT _libraries_work)
if(_libraries_work)
if("${_list}" STREQUAL "")
set(${LIBRARIES} "${LIBRARIES}-PLACEHOLDER-FOR-EMPTY-LIBRARIES")
endif()
else()
set(${LIBRARIES} FALSE)
endif()
#message("DEBUG: ${LIBRARIES} = ${${LIBRARIES}}")
@@ -180,6 +185,20 @@ else ()
endif()
endif ()
if (BLA_VENDOR STREQUAL "All")
if(NOT BLAS_LIBRARIES)
# Implicitly linked BLAS libraries
check_fortran_libraries(
BLAS_LIBRARIES
BLAS
sgemm
""
""
""
)
endif()
endif ()
if (BLA_VENDOR STREQUAL "Goto" OR BLA_VENDOR STREQUAL "All")
if(NOT BLAS_LIBRARIES)
# gotoblas (http://www.tacc.utexas.edu/tacc-projects/gotoblas2)
@@ -500,6 +519,7 @@ if (BLA_VENDOR STREQUAL "NAS" OR BLA_VENDOR STREQUAL "All")
)
endif ()
endif ()
# Generic BLAS library?
if (BLA_VENDOR STREQUAL "Generic" OR BLA_VENDOR STREQUAL "All")
if(NOT BLAS_LIBRARIES)
@@ -702,5 +722,11 @@ else()
find_package_handle_standard_args(BLAS REQUIRED_VARS BLAS_LIBRARIES)
endif()
# On compilers that implicitly link BLAS (such as ftn, cc, and CC on Cray HPC machines)
# we used a placeholder for empty BLAS_LIBRARIES to get through our logic above.
if (BLAS_LIBRARIES STREQUAL "BLAS_LIBRARIES-PLACEHOLDER-FOR-EMPTY-LIBRARIES")
set(BLAS_LIBRARIES "")
endif()
cmake_pop_check_state()
set(CMAKE_FIND_LIBRARY_SUFFIXES ${_blas_ORIG_CMAKE_FIND_LIBRARY_SUFFIXES})